Indicating system



L. POLINKOWSKYI.

INDICATING SYSTEM.

APPLICATION FILED NOV. I, 1919.

1,388,887. Patented Aug. 30; 1921.

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8 [pa Palm/(away I JMM W a?" W L L. POLINKOWSKY.

INDICATING SYSTEM.

APPLICATION FILED NOV. 1, 1919.

Patented Aug. 30, 1921.

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INDICATING SYSTEM. 7 AIPPLICATION FILED NOV-1, I919- 3 SHEETS-SHEET 3.

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PATENT OFFICE.

LIPA ronmxowsxxor nn'rwnnr, nn-LGIUM, ASSIGN'OR' "ro'wnsrmm EnEc'rmo COMPANY, INCORPORATED, OF NEW YORK. I

To all whom it may concern: Beit known that I, L ra POLINKOWSKY, a citizen of Russia, residing at Antwerp, Belgium, have invented certain new and useful Improvements in Indicating Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to telephone ex.-

- change systems and particularly to systems in which telephone circuits are extendedby automatic switches to operators positions, where the operators, by means of connecting apparatus attheirdisposal, completethe. establishment of the connections, L The object of the invention to provide an improved indicating device at 'thefoperators, positions for, visually indicating to 'the operators the designations of lines with I which connections are desired. 20

A feature of the. invention relates to an indicating mechanism at an operators position, in which a plurality of relays are air.- ranged to be variably operated under'the control of a register sender for selecting and displaying a desired numericaldesignation upon visual indicating devices.

Accordingto 'another'feature of this inventiona plurality of counting. relays are arranged to bev operated under the control istered, to select the proper numerical .indi; eating devices for displaying the desired designation. By means of the arrangement involving this feature, the register sender, which controls in'its operation the selection of the indicating'devi-ces, is also adapted to control selective switches for extending the connection to the position at which the indicator islocate'd.

Such other features and advantages as are contemplated by the present invention will become apparent from the following de-' scription and the appended claims, p

In the drawings which form a part of this specification there is shown in Figure lto the left of the broken line a portion of a cordcircuit' terminating in a first group selector, diagrammatically illustrated, and a second group selector also represented dial grammatically. To the right of'the broken line is shown the incoming end of a trunk line at a distantmanual exchange terminating in a cord circuit at an operators posi- I Specification of Letters Patent. .Application filed i Iovernb er 1, 1919. Serial m; 334,922.

nism either by means of -afkeyboard operators impulse transmitterQ YORK, 1v. Y.', A CORPORATION 01 NEW mnicarme sxsrnrr.

,1tion together with .subscribers line belong ng to the manual exchange.

F'g; shows the fdetailed' circuit and apparatus ofacall indicatingdevice located at the operators position.

Fig. 3 shows circuits and apparatus of' a exchange' which serves to control the opera- Pateiited Aug;

gregister controlling mechanism inthefirst tion of the selective switches and also the call .indicating device in the manual exchange; For av study of the drawingsthe figuresshould be arranged as follows; Fig. 2

2 tothe right of p and Fig.3 below Fig. l.

" The. present invention is applicable to sys tems wherein means are provided forextending subscribersi'lines either to anloperators position in the exchange or directly toqa register-controlling mechanism. In

,case a subscribersline, is automatically extended to a register-controlhng mechanism upon the initiation of a call, an impulse transm tting device. located at the calling substation may be utilized to position the registers of the controlling device in accords.

ance witlrthe digits of the desired number.- These registers when positioned are thereaf ter operative;tocontrolthe movement of sev elector switches to establish thedesiredconof the operation offthe registers of aregis ter sender, 'upon which a de signationis reg g are employed to assist in the completion of connections, a. calling line is usually exmotion. In case the calling exchange is of the seml-automatic type, where operators nation from the calling subscriber, thenpro-v ceecls to; set the register-controlling mechaor an In the present arrangement, which has. to

ido particularly with' a system in whichfacilities are glven for establishing connections between a semiautomatic or a full auranged to control the operation of call indicacontrolling functions.

tomatic exchange and a distantmanual offlee, the reglster-controlling mechanism is arthe right of Fig. 1 he firstcauses the register-controlling mechanism shown in Fig.

to be adjusted in accordance with the number of the desired line. Having thus been positioned, the register-controlling mechanism operates to first extend the calling line to a trunk line leading to the desired manual ofiice whereupon said controlling mechanism, continuing to operate, causes the display of the digits of the called line on a visual indicating device at the operators position.

g The register-controlling mechanism comprises a pluralityof sequence switch reglsters, one for each of the several digits, and each having ten diflerent circuit controlling positions. Theparticularltype of controlling mechanism disclosed is designed to be variably positionedunder the control of a stepping relay operated by series .of impulses sent from a calling transmitter. A sequence switch associated with theincoming circuits from the impulse transmitter serves to successively transfer the controlling stepping relay from. one register to the next. When the registers have assumed their set positions they. then run through their remaining positions to successively control the desired selective operations. t

will be understood that where it is desired to set the register mechanism by means of an operators keyboard a suitable wiring arrangement from the several rows of keys may be used instead of the stepping relay to determine the positioning of the registers. For a more detailed explanation of the method of operation of the sequence switch registers and of the necessary construction of the calling transmitter for cooperation with the register-controlling mechanism, reference is made to an application filed by Polinkowsky and Matthies,-June 14, 1919,

7 Serial No. 30 1212; 7

' A clearer understanding may be had of this invention from a detailed description of the operation of the system in which it is embodied.

Assume that it is desired to extend a connection from the first'exchange to a sub scribers line in the distant manfual exchange. The. calling subscriber upon initiating the call has his line extended in any well-known manner to the cord circuit including repeating coil 90. Inany well-known manner the calling subscribers line is thenextended over conductors and 71 by means of a cord plication, Serial No. 304,212, filed June:14,

77 to the grounded conductor 76.

It may be noted at this time that the register mechanisrnis controlled by'two sequence switches 320 and 350. All sequence switch contacts above and to the left of the uppermost broken line in Fig. 3 are controlled by sequence switch 320, whereas sequence switch contacts below and to the right of saidbroken line are controlledby sequence switch 350. The contacts within the small rectangles at the bottom'of the figure are controlled by the respective registers 100 110, 120, 130 and 140. v

WVhe'n, therefore, relay 323 energizes by means of a ground placed on the conductor 76 in the manner explained in the abovementioned application, sequence switch 320 is driven from position 1 to position 3 by means of a circ uit including contact 322 (1) and the left-hand winding of relay 323. Sequence switch 320 comes to rest in position 3 and at its contact 315 closes a circuit for the interrupter 316 in serieswith the primary winding of the dialing tonecoil 317. As soon as relay 325 energizes in series with conductors 70 and 71, and sequence switch 320 has reached position 3, a circuit is closed. from ground, armature and back contact of relay 323, armature and front contact of relay 325, left-hand winding of differential relay329, armature and back contact of said relay, contact 330 through the winding of. register 100 to battery and ground. At the same time a parallel circuit is closed through the right-hand winding of relay 329 to ground at the armature of relay 32 3. The relay 329, being differ ential, does not'energize when a circuit is closed for both of itswindings. Register 100, however,vstarts from position 0. 'Between. positions 0 and 1 of register 190 the local contact 103 is closed and the left-hand winding of relay 329 is shunted out, permitting said relay to energize.

The dialing tone, when impressed on conductors 311 and 312, signifies that the apparatus is in condition to receive impulses- Upon. the first interruption of the impulse circuit, relay 325 retracts its armature and .opens the right-hand winding of relay 329,

which relay thereupon deenergizes. As the impulse circuit again closes, register 100 is energized once more and moves out of position 1. Relay 329 energizes, the register passes to position 2 and at the nextinterruption of the impulse circuit relay 329 be- 'the'construction of the impulse sender, is

made comparatively long, the circuit of relay 334 is closed-for a sufficient interval to pen mit such relay to operate. A circuit is now completed from battery through the righthand winding ofrelay 323 to ground at the armature of relay 334. 'Re'lay 323 energizes and; closes a circuit through its left-hand windingand contact 322'to drive sequence switch 320 out ofposition" 3. Before sequence switch 320 can reach-position 6 the impulsecircuit is again closed and relay 334 deenergizesto in turn cause the denergization of relay 323. Sequence switch 320,

therefore, steps in position 6. V

In position 6 of sequence switch 320 the stepping relay 325 in the incoming impulse circuit'is operatively associated with a.sec- 0nd number register 110. The vibration, of

the armature of said relay in response to the second series of impulses causes, in a manner similar to that described, the setting of the register 110 up to a position corresponding to the number of impulses in such series. The method of setting the register 110 and the remaining successive registers 120, 130, 140 under the control of the stepping relay 325 will not be described in de tail herein. For a full and specific description of the setting of these registers reference is made to applicants' co-pending application filed June 14, "1919, Serial 1N0. 304,212, wherein there '-is' shown a registercontrolling mechanism similar in all respects to the one disclosed in the present application As soon as positioned," sequence switch 320 advances into position6. A circuit is then completed H fondriving sequence switch 350 into posi-' tion 3'. j This circuit may be'traced through thewvinding of sequence switch 350, contact'351 (1), contact 353 (6) toground. In position 3 of sequence switch'350 the fundamental circuit for controlling the *through to the distant manual exchange, the

brush selection; of thefirst group selector shown in Fig. lis closed. This circuit may betraced from ground, contact 354 (3),

contact and armature of relay 357 through the windingot stepping relay 355, conductor 396, contact 74, contact '7 8 through the windthe first register 100-has been ingof relay 79 to battery and ground. In

thewell-known manner relay 79' closes a circuit for the brushtripping spindle power n magnet (not shown) of the first group selector and brush selection takes place, stepping relay 355 in the fundamental circuit being short circuited for each brush tripspindleu Each time relay 355 deenergizes a circuit is closed'from ground over its armature and contact, contact 356, left-hand winding and armature and contact of differential relay 359, contact 342 (3), contact 102 through the windingof the register 100 tobattery and ground. Hence, for each reping position passed over by the tripping traction of the armature 'of'the relay 355, the register 100 advances one position." hen register 100 reaches position ,0, se-

quence switch 350 is driven into position 4 by means of a circuitincluding contact-341 (3), contact 102 (0), contact 343 (3), con= tact and armature and left-hand winding of relay 359, contact 356, and armature and relay 355. completed at the firstgroup selector, trunk hunting follows and J the selected set of After brush selection has been brushes 93, 94 and 95 are driven to the ter- "minals 60,61 and 62 of an idle trunk lead-.

ing to a secondgroup selector 63, 64, 65.

When the second register 110 has been positioned and sequence switch 320 passes into position 8, the sequenceswitch 350 is driven from position 4 into position 6. The

circuit for moving said sequence switch out otposition 4 includes the contact 351 (4) and contact 353 (8). In position 6 otsequence switch 350 the. fundamental. circuit is closed through to the second group selector, and brush selection takes place under the control of thethousands register 110 in the manner described in the abovementioned application, Serial No. 304,212,

filed June 14, 1919. At the end of brush selection of the second group selector, trunk" hunting ensues and the brushes 63, 64 and 65 are driven into engagement with the :ter-

minals 66, 67 68' of an idle trunk 411, 412,

leading to the distant manual exchange. Se-.

quence switch 350 at the endot brush selection at the second group selector isv also drii en'itrom position 6 into position 7" by means of 'a circuit from battery throughthe winding of sequenceswitch 350,'contact 341 (6), contact 102(0), contact 342 (6), contact 111 (0), contact343 (6), contact and armature and left-hand winding of relay 359,

contact 356110 ground at the contact and armature of relay 355.

The connection having thus been extended 1 sequence switch (not shown) of the first group selector circultsis now advanced to "a position to extend the f'undamentalcircuit The fundamental circuit may be traced from battery, resistance 414, back contact and right-hand armature of relay 415, upper lefthand winding of repeating coil 416, through the windings of relay 413 in series, lower left-hand winding of repeating coil 416, back contact and left-hand armature of relay 417, conductor 412, terminal 67, brushv 64, terminal 61, brush, 94, contact 92,contact 74, com

ductor 396, through the winding of stepping relay 355, armature and contact of relay 357,- contact 358 (9) left-hand armature and back contact of relay 378, conductor 397, contact.

75, contact 91, brush 93, terminal 60, brush 63, terminal 66, trunk conductor 411 to ground at the back contact and right-hand armature of relay 418. It may be observed that sequence switch 350 passes from position 7 into position 9 to close contact 358 as soon as register 130 has been positioned and sequence switch 320 moves into positlon 13. The circuit for driving sequence switch 350 into position 9 is traceable from battery, through the winding of said sequence switch, contact 351 (7), contact 353 to ground. The right-hand high resistance winding of relay 413 prevents the energization of steping relay 355 in the fundamental circuit. llelay 413 closes a circuit from battery over its left-hand armature and front contact, lefthand armature and contact of relay 418, through the left-hand high resistance winding of relay 419 through the winding of relay 417, conductor 591, through the winding of relay 431, left-hand armature and contact of relay 432 to ground at the back contact and armature of relay 433. Belay 417 cannot energize in series with thehigh resistance winding of relay 419. Relay 419, however, attracts its armature and closes a circuit from battery over the left-hand armature and back contact of relay 415, arma ture and front contact of relay 419 through the right-hand lowv resistance winding of relay 419 toground as above traced at the armature of relay 433. This circuit shunts out the left-hand high resistance winding of relay 419, and relays 417 and 431 become energized. The fundamental circuit is now ex'-- tended to the call indicator shown in Fig. 2 and may be traced from battery through the winding of relay 452, back contact and lefthand armature of relay 434, conductor 592, front contact and left-hand armature of relay 417, trunk conductor 412, and thence through the winding of stepping relay 355 as above traced, returning by way of trunk conductor 411 to ground at the back contact and right-hand armature of relay 418. Both the stepping relay 355 and relay 452 ener gize in the fundamental circuit. Relay 452 establishes a circuit from ground, armature and front contact of relay 431, contact and armature of relay 435, armature and front contact of relay 452, through the windings of relays 436, 447 and 448 to battery atthe contact and armature of relay 439. In a parallel circuit relays 437- and 438 are also energized. The circuits are now prepared for operating the counting relays of the numberindicating deviceunder the control of the hundreds register 120 in the calling exchange to select the desired number lamp or even thousand. and lamp .511 for thefirst or odd thousand. As willbe more clearly explained hereinafter, the selection of the proper thousands lamp is determined by the setting of the thousands register llO which controls the operation of the second group selector in'the calling exchange. The hundreds lamps are associatedwith each other in pairs, each pair comprising an even hundreds lamp and the next succeeding odd hundreds lamp as, for instance, the zero and first hundreds lamps 520 and 521. The selection of the proper pair of hundreds lamps is ac- 1 complished by the counting relay set and the selection of the even or odd hundreds lamp in the pair is determined by the setting of the hundreds register 120, as will be later explained.

When, therefore, afundamental circuit is completed, as above described, and relays 436, 447, 448, 437 and 438 are energized, a circuit is closed to ground as follows: Battery, winding of relay 452, back contact and left-hand armature of relay 434 and the contact and armatureof relay 438. This direct circuit to ground over relay 452 shunts out .the stepping relay 355 at the register-controlling mechanism. Relay 355 deenerglzes and closes a circuit from ground over its armature and contact, contact 356,

left-hand winding and armature and contact of relay 359, contact 345 (9), contact 121 through the Winding of register 120 to battery. In the well-known manner register 120 advances one step toward its normal position. Relay 437 which energizes simultaneously with relay 438 closes a circuit from ground over its armature and contact, left-hand armature and back contact of relay 441, right-hand armature and back contact of relay 469 through the upper counting relay .479, normally closed contact of relay 442, front contact and armature of relay 447 vto battery to ground. Relay 479 energizes and prepares. a circuit for the lower counting relay 469 which extends over the left-hand armature and contact of relay tact of relay 443. Relay 469, however, is

479 toground at the normally closed connot energized so long 1 as its winding is shunted out by the direct circuit to ground [at thecontact and armature of relay 437.

Relay 448 is constructed to attract its armature slowly. As soon as relay 448 closes its front contact, relay 439 is energized and attracts its armature to open the circuit of 120 advances to the next position.

relays 436, 447, 448, 437 and 438. Relay 438 immediately releases its armature, removes the shunt from aroundstepping relay 355 which relay again energizes. When relay 437 retracts its armature, the lower counting relay 469 becomes energized in series with relay 479. Relay 448 immediately;

releases its armature and opens the circuit of slow-to-release relay 439,which, after an interval again closes the above traced circuit for relays 436, 447, 448, 437 and 438. Relays 436 and 447 are. made sufficiently sluggish so as not to release their armatures during the tnne'the armature of relay 439 is attracted. Hence the first pair of counting relays 469 and 479 remains lockedup over the left-hand armature and front contact of relay 447. Immediately that relay .438 again attracts its armature the stepping relay 355 at the register-controlling mechanism is shunted and hundreds regisltzer .e lay 437, energizing, closes a circuit from groundover its armature and contact, lefthand armature and back contact of relay 441, right-hand armature and front contact ofrelay 469, right-hand armature and back 1 contact of relay 460 throughlthe lamp 551,

winding of relay 470, normally closed contact of relay 442 to battery at the front con tact and armature of relay 447. Relay 470 energizes and prepares a circuit for the lower counting relay 460. As soon as relay I 439 is energized, as above described, and rethrough which the hundreds register 120 is driven. When register 120 reaches position 0, a circuit is closed from battery through the winding of sequence switch 350, contact" 341 (9), contact 102 (0), contact 342 (9), contact 111 (0) ,cOntact 343 (9), contact-121 (0), contact 345' (9),'contact and armature and left-hand winding of relay 359, contact 356 to ground at the contact and armature of relay 355. In a circuit'parallel' to the one just traced, relay 357 isalso energized. Relay 357 opens the fundamentalcircuitwhile sequence switch 350' moves from position 9 windin g,

into position 10. As soon as relay 438 deenergizes after the fundamental circuit has been opened by relay 357, relay 452 releases its armature. ll ith relay 452 deenergized, and relay 436 still maintaining its armature attracted a circuit is closed from battery through the winding of relay 444, back contact and armature of relay 445, front contact and armature of relay 436, back contact and armature of relay 452, armature and contact of relay 435 to ground at the front contact and armature ofrelay 431. At the same time a circuit is closed for one of the lamp-selecting relays, such 'as 480 and 481. Assume, for example, that thethousands digit is even and that only the first two counting relays 469 and47 9 were energized under the control of the hundreds register 120. In this case the lamp-selecting relay, such as 480 is the one energized and its circuitmay be traced from battery to the winding of said relay, back contact andlefthand armature of relay 460, left-hand armature and front contact of relay 469, back contact and armature of' relay 444, and. thenceto ground in parallel with the circuit above traced for relay 444. Relay 444 is made slow-to-energize so that relay 480is given suflicient time to attract its armature before its energizing. circuit can be opened at the back contact of relay 444. Relay 480 energizes and locks up in a circuit over its contact and armature, through the zero thousands lamp- 510, to ground at the front contact and armature of relay 431.. Relay 444, after an interval, attracts its armature and closes a circuit from battery through its armature and front contact, through the winding ofrelay 445 to ground at the front contact and armature of relay'105 431. Relay 445 does not energize, how ever, at this time, since its winding is shortcircuited over the 'circuit above traced through the front contact and armature of slow-to-release relay 436; 'When, after an interval, relay 436 retracts its armature, relay 445 becomes energized in series with re-. lay 444. Relay447 also slow-to-deenergize is arranged to release its armature slightly before the release of relay 436. When relay at contact 358 and relays 3 55 and 452 attract their armatures ready for controlling the selection of the tens number lamps in aci cordance with the positioning of tens register 130. When relay 452 energizes it closes.

the above described circuits to cause the energization of relays 436, 447, 448, 437 and 438. Relay 437 closes a circuit from ground ture. Relay 438 energizes and shunts out the steppin relay 355 in the fundamental circuit. 2 why 355 closes a .circuit from ground over its armature and contact, con

tact 356, left-hand winding and armature: and contact of relay 359, contact 346 (11),

contact 131 throughthe winding of tens register 130 to battery. Register 130, as is well understood, advances one step from the position in which it is standing. (hen relay 439 operates to open the circuit of relays 436, 447, 448, 437 and 438, relays 469 and 479 lock up in-series with each other to ground at the normally closed contact of relay 443.

Relay 438, deenergizing, removes the shunt fromaround stepping relay 355 which there--.

upon attracts its armature. henrelay 439 deenergizes to again close the circuit of relays 437 and 438, the upper counting relay 470 of the second pair is energized, relay 438 shunts out the stepping relay 355 and the register 130 advances through another, position. This operation continues, one 133.11,

of counting relays being energized and locked up for each position to which the register 130 advances until said register has been restored to its 0 position. In position 0 of the register 130, relay 357 and sequence switch 350 are energized in parallel circuits,

leading over contact 347 (11), contact 131 (0), contact 346 (11) contact and armature and left-handwvinding of relay 359, contact 356 to ground at the armature and. contact of relay 355. Relay 357 opensthev fundamental circuit whereas sequence switch .350 moves out of position 11 and into position 12. As soon after the fundamental circuit has been opened at the register-controlling mechanism as relay 438 releases its armature, relay 452 becomes deenerglzed.

1th relay 452 de'energized and the slow-operating relay 436=maintaining-its armature attracted, a circuit is closed from ground, armature and front contact of relay 431, contact and armature of relay 435, armature and back contact of relay 452, armature and front contact of relay 436,. armature and.

front contact of relay 445, right-hand armature and back contact of relay 442 through the Winding of relay 446 to battery. At the time to attract its armature.

same time a circuit-is closed for the par- ;ticular tens number lamp relay which has been selected by the counting relay set. As-

sumingthat relay 492 is the one selected, its

to ground over the circuit above traced for relay 446. Relay 446 is constructedso as to,

attract its armature slowly, and therefore 30 does not energize to open the circuit of relay 492 until after said latter relay has had Relay 492, when energized, locks up over its contact and armature to ground at the front contact and armature of relay 431. Relay 446 at its right-hand armature closes a circuit in series with relay 442 to ground at the front contact and armature of relay 431. Relay 442,: 1 which remains shunted as long as relay 436 0 is retaining its armature, operates in series with relay 446 as soon as'relay 436 deener= gizes. Relay 447, which releases its armature slightlyprior to the deenergization of relay 436 opens the locking circuit of the counting relays before relay 442 has time to energize and'attract its left-hand armature. ,Sequence switch 350 at the register+con trolling mechanism, on reaching position 12, is advanced into position 14 as soon as Sequence switch 320 has reached position 15. T he circuit for sequence switch 350 will be traced from battery to the winding of said sequence switch, contact 341 (12) to ground.

at the contact 331 (15). In position 14 of 05 sequence switch 350', the fundamental circuit is again closed at contact 358 and relays 355 and 452 energize ready for the selection of the unitsnumber lamp of the call indicator mechanism under the control-of the units register 140. Relay-452 again closes the circuit of relays 437 and 438, causing the ener- "359, contact 346 (14), contact 141 through.

the windingof the units register 149 to battery. Register 140 advances through one position and upon the release of relay 438 stepping relay 355 is energized. When relay 437 releases its armature, the shunt is removed from around the lower counting relay 469 which relay thereupon locks up in series with relay 47 9. The holding circuit for the counting relays may now be traced from; battery over the'uleft-hand armature and front contact of relay 442, through the HQ windings of relays 479 and 469 in series, contact and armature of relay 479 to ground at the normally closed contact of relay 443. I

On the next energization and deenergization of relays 437 and 438, the second set of" counting relays: 470 and 460 are energized and locked up, stepping relay355 is oper-' ated and register 140 is driven to another position.

time parallel circuits are closed for relay 357 and sequence switch 350. These clrcuits includeicontact 347 (14), contact 142 .(O), back contact and armature of relay 37-4,

the fundamental circuit. while sequence.

switch 350 advances from position 14 into position 16. As soon after the fundamental circuit is opened at relay 357 as relay 438 deenergizes, relay 452 releases its armature. A circuit is thereupon closed from battery to the left-hand winding of relay 434, front contact and right-hand armature of relay 442, front contact and armature of, relay 445, front contact and armature of relay 436, back contact and armature of relay 452, armature and contact of relay 435 to ground at the front contact and armature of relay 1 a 431. Relay 434, at its left-hand armature,

opens the circuit of relay 452 to prevent the further energization of this relay. At its right-hand armature relay 434 closes circuits from battery through the windings of relays 455 and 456, right-hand winding, front contact and armature of relay 434 to ground at the front contact and armature of relay Relays 455 and 456 prepare circuits for the selected hundreda'tensand unitsnumber indicating lamps. The circuit of the hundreds lamp may be traced from battery, right-hand armature and front contact of relay 480,through the even or zero hundreds lamp 520, back contact and right-hand armature of relay 449 to ground at the contact and right-handarmature of relay456; The circuit for the selected tens lamp may be traced from battery, left-hand armature and front contact of relay 492 through'the No. 8 tens lamp 581 to ground at the contact and outer 1eft-hand armature of relay 456. The circuit of the selected units lamp as, for instance lamp 541,is traceable from ground, left-hand armature and contact of relay 455, left-hand armature and back contacts of .relay 441, right-hand armatures and front contacts of relays 469 and 460, right hand armature 'and back contact of relay 461 through the units lamp 541, winding of' relay'471 to battery through the front contact and left-hand armature of relay 442.

After the units register 140 has com- This operation continues until. register 140 reaches position 0, at whichrelay 422.

pleted its controlling functions, the registercontrolling mechamsmis restored to normal and the controlling sequence switch of the .first group selector, is driven into its talk- .ing position 1n the -manner descrlbedl in. the above-mentioned application, Ser1al No.

304,212, filed June 14,1919. WVith the sequence switch contacts 91 and 92 in their talking position, such as position 9, the trunk circuit 411 and 412 is extended through to the repeating coil 90. Relay 435 is now energized in a circuit, from ground through the winding of said relay, front contact and left-hand armature of relay 434, conductor 592, front contact and left-hand armature of relay 417, trunk conductor 412, terminal 67, brush 64, terminal 61, brush 94, cont act 92, supervisory relay 87, through the lower right-hand winding of repeating coil 90 to battery and ground. The purpose of relay 435 which energizes at this time will be de scribed in detail hereinafter.

lVhen relay 455 energizes the following circuit is also closed to cause the lamp 410 at the operators position to flash, indicating that a call is awaiting attention uponthe call indicator: ground, interrupter 461, right hand armature and contact of relay 455, back contact and right-handarmature of relay 432, conductor 593, front contact and right-hand armature of relay 417 through the lamp 410, back contact and armature of relay 413 to'battery and ground. The operators attention being attracted by the flashing of lamp410 observes thedesigna tion'display'e'd upon'the call indicator lamps and seizing plug 421 of the trunk 411, 412 inserts it in the jack 420 of the calledv line 400. Relay 422 is thereby energized in acircuit overthe sleeve of the plug 421 and cut off relay 427. At the left-hand contact of relay 422, parallel circuits are closed for the energization of relays 415, 423 and 428. The circuit of relay .428 extends from'gbattery through the lower right-hand winding o-f-re peating coil 416, windingof relay 428', armature and back contact of relay 424 toground at the left-hand armature. and contact of relay 422. The circuit of relay 423 extends ;ing of relay 41 9, and relay 417'beiiig unable to remain energized in series with the left hand high resistance winding of relay 419 releases its armatures. Trunk circuit 411,412 is now connected through the left-hand-windings of repeating coil 416. The relay 428 short-circuits the high resistance winding of relay 413 permitting the energization of supervisory relay 87 in the calling exchange. When relay 415 energizesit closes a circuit "from battery over its left-hand armature and front contact, through the windingof slowpervisory relay 87 in the calling exchange is now deenergized and may serve in any wellknown manner to move the sequence switch into an advanced position and display a ringing signal. Relay 415 also closes a circuit from battery over its left-hand armature and front contact through the left-hand winding of relay 418, right-hand armature and back contact of relay 417 to ground at the left-hand armature and contact of relay 422. Relay 418 energizes and looks up in a circuit from ground over its right-hand armature and front contact and right-handwinding to battery at the front contact and' armature of relay 413. Relay. 418, atits lefthand armature, opens the circuit through the high resistance winding ofrelay 419, and relays 419 and 431 become deenergized. The release of relay 431 opens the holding circuits of relays 444, 445, 446 and 442. These relays deenergize causing the release of the call indicator mechanism.

When relay 423 attracts its armatures it closes a circuit for the application of ring ing current to the called line. This circuit extends from the ringing source 463 through the right-hand winding of relay 429, front contact and right-hand armature of relay 423, tip of the plug 421 and jack420 over the loop of the line 400, ring of jack 420 and plug 421, right-hand armature and front contact of relay 422 to ground at the lefthand armature and front contact of relay 423. As soon as the called subscriber re sponds, relay 429 energizes and locks up in a circuit over its left-hand winding to ground at the left-hand armature of relay 422. Relay 429 opens the circuit of relay 423 which, by releasing its armatures, completes the talking circuit from the right-hand windings of the repeating coil 416 through to the called line 400.

At the termination of conversation the operator removing plug 421 from jack 420 causes the cleenergization of relays 422 and 424; Relay 422 opens the holding circuits of relays 415 and 429 so that these relays now release their armatures. When the called line supervisory relay 428 decnergizes as the called subscriber hangs up his receiver, the supervisory relay 87 in the calling exchange is also denergized and may operate toeither display a disconnect signal before an operator or initiate the automatic release of the switching mechanism in said exchange.

If the called line 400 is busy the operator, after havingtested the jack 420, then inserts the plug 421 into a busy jack 430. Relay 422 energizes in series with the resistance 425 and closes a circuit for the energization of relay 415- as described. The relay 424, however, being marginal, does not energize in parallel with relay 422 in a circuit includ ing the resistance 425. Therefore, the relayv 428 remains permanently energized and short-circuiting the righthand winding of relay 413 permits the energization of supervisory relay 87 in the calling exchange. Relay 87 by remaining energized may cause in any suitablemanner the continued display of asupervisory signal to indicate to an operator that the called line is busy.

It will next be considered that the called line in the manual exchange belongs to the second or odd thousand. In other words, the thousands digit of the'line will be 1. Furthermore, it will be assumed that the second or hundreds digit of the called line is odd as, for example the digit 1, next sue 'ceeding the digit 0. It will be remembered that the hundreds digit of the line 400 previously described was taken as 0, the zero hundreds lamp'520 being lighted, and that the next succeeding odd hundreds digit lamp 521 is the one which mates with lamp 520.

As is well understood, the grouping of trunks and lines at the switches of the character used in this system is arranged on the basis which does not correspond with the basis of decimal numbers. Accordingly, the register-controlling mechanism must be designed so as to control the operation of the switches in the selection of trunks and lines, arranged on some arbitrary basis, so that the final selection of the line may be made in accordance with a designation based on the decimal system. To this end the register-controlling mechanism is capable of performing certain translations when either the thousands digit or the hundreds digit is odd. If the thousands digit is odd, the thousands register 110, as will be explained hereinafter,'is made to step to its ninth position, which means that the group selector under its control is directed to the same level of trunl-ts to which it would have been directed had the thousands digit been the next lower even'digit. Then later during the hundreds selection operation the hundreds register 100 has reached its position 0, the thousands register 110 is then drivenfrom position 9 to position 0, and this additionalstepis made to control the hundreds group selector so that an additionalstep is taken and the connectionextended over a group of trunks leading to the proper odd thousand. If the both being the digit 1, registers 110 and 120 are driven to their complementary posi tions 9. lVith register 110 in position 9, relay 360 is energized during the time sequence switch 350 is passing through position 5. The circuit of relay 360 is traceable from battery through the winding of said relay, contact 112 (1) to ground at contact 340. Relay 360 locks up in a circuit over its left-hand armature to ground at contact 361 (6). hen brush selection takes place at the selector 63, 64, 65, and the fundamental circuit is closed at contact 358 in position 6 of sequence switch 350, relay 355 becomes energized The trip spindle in the well-known manner advances toward the first brush-tripping position where it shortcircuits the stepping relay 355. Relay 355 deenergizes and closes a circuit from ground over its armature and contact, contact 356, left-hand winding and armature and contact of relay 359, contact 343 (6), contact 111 (9), right-hand armature and front contact of relay 360, contact 113 (9), contact 342 (6), contact 102 (0), contact 341 (6), through the windings of sequence switch 350 and relay 357 in parallel to battery. Sequence switch 350 goes into position 7 while relay 357 opens the fundamental circuit. Hence, as the tripping spindle reaches the first brush-tripping position, the fundamental circuit is opened in the well-known man-. ner at the group selector and brush selection ceases. This means that the first level of trunks leading to the manual exchange has been selected, the thousands digit being 1, and the register 110 remains in position 9. The same level, of trunks is selected when the thousands digit is the next lower even digit, the register 110 being, in this case, in position 0.

Circuits at the manual exchange are now prepared as hereinbefore described in detail for the selection of the hundred indicator lamp. Sequence switch 350 goes into position 9 and the fundamental circuitis extended through to the indicator mechanism counting relays 479 and469. With register 120 in position 0, the thousands register is next restored from position 9, to position 0 by means of the following. circuit: battery, through the winding of register 110, back contact and right-hand armature of relay 360, contact 111 (9), contact 343 (9), contact 121 '(9), contact 345 (9), contact and armature and left-hand winding of relay 359, contact 356 to ground at the armature of relay 355. It will be observed that relay 360, which was locked up over its left-hand armature deenergizesras soon as sequence switch 350 passes out of position 6 to open contact 361. Register 110 in passing from position 9 to position 0 sends an impulse over the fundamental circuit in addition to the impulse sent by the hundreds register, and consequently the second pair of counting relays 470 and 460 are energized and locked up. lVith register 120 in position 0, sequence switch 350 is now driven from position 9 into position 11 to control the tens selection. The circuit for driving sequence switch 350 into position 11 extends from battery through the winding of said sequence switch, contact 341 (9), contact 102 (0) contact 342 (9), contact 111 (0), contact 3431(9), contact 121 (0), contact 345 (9), contact and armature and left-hand winding of relay 359, contact 356 to ground at the armature and contact of relay 355. Since two pairs of counting relays are locked up at the indicator mechanism the second relay 481 is energized instead of the first relay 480 when relay 452 releases its armature. The circuit for relay 481 extends from ground, armature and front contact of relay 431, contact and armature ofrelay 435, armature and back contact of relay 452, armature and front contact of relay 436, armature and back contact of relays 445 and 444, contact and left-hand armatures of relays 469 and 460, left-hand armature and back contact of relay 461 through the winding of relay 481 to battery. Relay 481 energizes and locks up in a circuit over its left-hand contact and armature through the odd thousands lamp 511 to ground at the front contact and armature of relay 431.

On passing through position 8, sequence switch 350 at its contact 344 closes a circuit for relays 373 and 374. This circuit leads from battery through the windings of these relays, contact 344 (8) to ground at contact 122 of the hundreds register, which is closed in position 9; Relays 374 and 373 lock up in a circuit over the armature and contact of relay 373, contact 143 closed in positions 1 to 9 to ground at contact 352. After the-tens digit lamp has been selected and the fundamental circuit is again closed to perform the selection of the units lamp under-the control of the units register 140, relays 355 and 452 become energized. As

hereinbefore explained, sequence switch 350 is now standing in position 14. The units register 140 restores to its 0 position, a pair of counting relays being energized and locked up for each of the successive positions 7 passed over by said register.

Since the hundreds digit is odd the units register instead of coming to rest in position 0, as in the case of an even hundreds digit, passes through a complete additional cycle of operation. The circuit for driving register 140 out of position 0 may be traced from battery through the winding of said register, front contact and armature of relay 374, contact 141 (0), contact 346 (14), and thence to ground at the armature and contact of relay As a result of the register 140 making this additional cycle of operation, the entire set of counting relays are energized and locked up. When the last pair of counting relays 468, 479 energize a circuit is closed from ground, armature and contact of relay 437 left-hand armature and back contact of relay 441, right-hand armatures and front contacts of all of the lower counting relays, right-hand armature I and back contact of relay 441 through the winding of relay 443 to battery at the front contact and armature of relay 447. Relay 443 energizes, and at its left-hand contact opens the locking circuit of the counting relays. Relay 443 also closes a circuit in series with itself for the left-hand winding of relay 433. move the shunt from around the left-hand winding of relay 433, this relay operates and closes the following circuit: ground, armature and front contact of relay 433, through the right-hand winding of said relay through the windings of relays 441 and 449 in parallel and thence to battery at the left-hand armature and front contact of relay 442. Relay 443 again deenergizes, its circuit being opened at the right-hand back contact of relay 441. At the left-hand armature of relay 441, the circuit leading from the contact of relay 437 is shifted from the righthand armature of relay 469 to the right-hand armature of the second counting relay 460. )Vhen relay 437 energizes again, the units register 140 continuing to rotate, the second pair of counting relays 460 and 470 are energized and locked up. As the units register 140 reaches position 0 the second time, a number of pairs of counting relays corresponding to the units digit, as registered on the register 140, has been energized and locked up so that the pro-per units lamp is selected. Sequence switch 350 is now driven into position 17 by means of a circuit from battery, through the winding of said sequence switch, contact 341 (16), contact 102 (0), contact 342 (16), contact 111 (0), contact 343 (16), contact 121 (0),

As soon as relay 437 deenergizes to recontact 345 (16), and thence to ground at the contact and armature of relay 355.

Since the relay 449 at the indicator mechanism is energized in series with relay 433, a circuit is closed for the odd hundreds lamp 521 instead of for the even hundreds lamp 520. This circuit extends from battery over the right-hand armature and contact of relay 481 through the lamp 521, front contact and right-hand armature of relay 449 to ground at the right-hand armature of relay 456. Had the hundreds digit been even as, for instance, the digit 0 and the thousands digit odd, relay 481 would have been energized as explained, and since relay 449, in this case, remains de'elnergized a circuit for the zero lamp 520 iscompleted at the righthand armature of relay 481.

The relays 432, 454 and 453 in Fig. 2 are adapted to control restoration of the indicating mechanism in the event of a premature release by the calling subscriber. When relay 431 first becomes energized a circuit is closed for the left-hand winding of relay 454 including the back contact and righthand armature of relay 434 and the front contact and armature of relay 431. WVhen each of the controlling registers has been restored to normal at the end of the successive impulse series, relay 452 deenergizes and a short time later relay 436 releases its armature. A circuit is then closed from battery to the left-hand winding of release relay 432, contact and armature of relay 454, back contacts and armatures of relays 436, 452 and 435 to ground at the front contact and armature of relay 431. This circult is only closed for a brief period when the everohanging operation takes place at the register-controlling mechanism. The release relay 432 being of the sloW-to-operate character does not have suflicient time to attract its armatures while relays 436 and 452 are simultaneously deenergized. Should the call be abandoned before all of the calling registers have been set or should for any other reason the fundamental circuit be maintained opened at the register set longer than the normal period required for transition from one controlling operation to the next, relay 432 attracts its armatures. At the left-hand armature of relay 432, circuit of relay 431 is opened, and this relay, by decnergizing. causes the restoration of the indicating mechanism.

After. the completion of the selection of the units digit lamp, it will be recalled that relay 434 energizes. .At its right-hand armature and back contact this relay opens the above-traced circuit for the left-hand winding of relay 454. In the normal operation of the system, relay 435 energizes as hereinbefore described .in the circuit leading to battery and ground at the repeating coil 90 in the distant exchange. If release take place in the calling exchange at this time, relay 435 fails to energize when relay 434 attracts its left-hand armature and the following circuit is closed: battery, through the winding of relay 453, back contacts and armatures of relays 436, 452 and 435 to ground at the front contact and armature of relay 431. Relay 453, which is slow toenergize, attracts its armature after an inter val andcloses a circuit for the right-hand winding of relay 454. Relay 454 energizes and the above-traced circuit of the release relay 432 is completed to cause the restoration of the indicating mechanism.

What is claimed is: I

1. In a telephone system, selective switches for extending telephone connections, a controlling mechanism comprising a plurality of registers, means for positioning said registers, means for operating certain of said positioned registers for controlling the operation of said switches, a plurality of indicating devices, a series of relays, means for operating the remaining positioned registers of said mechanism, means controlled by the operation of such registers for operating the relays of said series, and means under the control of said relays for variably selecting said indicating devices.

2. In a telephone system, selective switches for extending telephone connections, a controlling mechanism comprising a plurality of registers, means for variably positioning said registers in accordance with desired designations, means for operating certain of said positioned registers for controlling the operation of said switches, a plurality of indicating devices, a series of relays, means for operating the remaining positioned registers of said mechanism, means controlled by the operation of such registers for 0perating the relays of said series, and means under the control of said relays for variably selecting said indicating devices.

3. In a telephone system, an operators position, selective switches for extending telephone connections to said position, a controlling mechanism comprising a plurality of registers, means for variably positioning said registers, means for restoring to normal certain of said registers to control the operation of said switches, a plurality of number indicating devices at the operators position, a series of relays, means for restoring to normal the remaining registers of said mechanism, means controlled by the restora tion of such registers for operating the relays of said series, and means under the control of said relays for variably selecting said indicating devices.

4. In a telephone system, an operators position, selective switches for extending telephone connections to said position, a controlling mechanism comprising a plurality of sequence switch registers, means for vari ably positioning said registers in accordance with the designations of called lines, means for restoring to normal certain of: said registers to control the operation of said switches, a plurality of number indicating devices at the operators position, a series 01; relays, means for restoring to normal the remaining registers of said mechanism, means controlled by the restoration of such registers for operating the relays of said series, and means under the control of said relays for variably selecting said indicating devices.

5. In a telephone system, selective switches for extending telephone connections, a controlling mechanism comprising a plurality of registers, means for positioning said registers, means for operating certain of said positioned registers to control the operation of said switches, a plurality of number indicating devices, a series of relays, means for operating the remaining positioned registers of said mechanism, means controlled by the operation of such registers for variably operating the relays of said series, and means dependent upon the number of relays operated'for selecting the desired indicating devices.

6. In a telephone system, selective switches for extending telephone connections, a controlling mechanism comprising a plurality of registers, means for positioning said registers, means for operating certain of said positioned registers to control the operation of said switches, a plurality of number indicating lamps, a series of counting relays, means for operating the remaining positioned registers of said mechanism, means controlled by the operation of such registers for variably operating said counting relays, and means dependent upon the number of relays operated for selecting the desired indicating lamps.

7. In a telephone system, an operators position, selective switches for extending talking connections to-said position, a controlling mechanism comprising a plurality of registers, means for positioning said registers, means for operating certain of said positioned registers to control the operation of said switches, a plurality of number indicating devices at the operators position, a set of counting relays, means for operating the remaining of said positioned registers, means controlled by the operation of such registers for operating in succession the relays of said set, and means dependent on the number of counting relays operated for variably selecting said indicating devices.

8. In a telephone system, selective switches for extending talking connections, a controlling mechanism comprising a plurality of registers, means for variably positioning said registers, means for operating certain of said positioned registers to control ,the operation of said switches, a plurality of groups of number indicating devices, a set of counting relays, means for operating in succession the remaining of said positioned registers, means controlled by each register in its operation for operating said counting relays, and means dependent on the number or relays operated for variably selecting a number indicating device in each of said groups.

9. In a telephone system, selective switches for extending talking connections, a controlling mechanism comprising a plurality of registers, means for variably positioning said registers, means for restoring to norma-l certain of said positioned registers to control the operation of said switches, a plurality of groups of number indicating devices, a set of counting relays, means for restoring to normal in succession the-remaining of said positioned registers, means con trolled by each registervin its restoration for operating said counting relays, and means dependent on the number of relays operated for variably selecting a number indicating device in each of said groups.

In Wit less whereof, I hereunto subscribe my name this 11th day of October, A. D. 1919.

LIPA PoLINKoWsKY. 

